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always clear the X2APIC_ENABLE bit for PV guest

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[ Upstream commit 5268c8f39e ]

Commit e657fcc clears cpu capability bit instead of using fake cpuid
value, the EXTD should always be off for PV guest without depending
on cpuid value. So remove the cpuid check in xen_read_msr_safe() to
always clear the X2APIC_ENABLE bit.

Signed-off-by: Talons Lee <xin.li@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Talons Lee
2018-12-10 18:03:00 +08:00
committed by Greg Kroah-Hartman
parent 73aa8292ca
commit c818b5b471
1 changed files with 1 additions and 4 deletions
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5
arch/x86/xen/enlighten_pv.c
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@@ -899,10 +899,7 @@ static u64 xen_read_msr_safe(unsigned int msr, int *err)
val = native_read_msr_safe(msr, err);
switch (msr) {
case MSR_IA32_APICBASE:
#ifdef CONFIG_X86_X2APIC
if (!(cpuid_ecx(1) & (1 << (X86_FEATURE_X2APIC & 31))))
#endif
val &= ~X2APIC_ENABLE;
val &= ~X2APIC_ENABLE;
break;
}
return val;